Electrical Engineering Stack Exchange
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Questions tagged [y-to-delta]

34 questions
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Extending the Delta-Wye/∆-Y Transformation to higher polygons

I was looking at the derivation of the ∆-Y Transformation and decided to replicate the process with a square and its diagonals, i.e. I tried to create a Square-Cross/□-X transformation. But the equations so formed do not seem to have a solution.…
Salieri
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Zero current assumption in star - delta transformations derivations

The formula used for star delta transformations are: $$ R_A = \frac{R_{AB} R_{AC}}{R_{AB}+R_{AC}+R_{BC}} $$ and $$ R_{AB} = \frac{R_AR_B + R_AR_C + R_BR_C}{R_C} $$ The normal way that these formulae are derived is by equating the expressions for…
Balu
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Proof that Delta and Y transformer have the same power?

I'm trying to proove that a Delta and Y transformer both have the same power. Somewhere I must get wrong in my process... I have a reading in voltage and current in a Star transformer: 600 V line-line (347 line-ground) and 5 A going through each …
Cherry
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Running a 3ph motor rated for 380v star on 220v delta

I've got an old Soviet 4kW motor, made in 1983. The dilemma is that the nameplate info states a Y-connection/380v/8.7amps and I want to run it on delta using my VFD which produces 3ph 220v. All my other motors are rated for both 220v delta & 380v…
Ivan P.
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Y to Delta transform with inductors?

Does a Y to delta transform for resistors work the same way when inductors a connected in a similar fashion? simulate this circuit – Schematic created using CircuitLab I have a load bank that is wired in a Y configuration. I'm given the specks for…
vini_i
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Breaker trips after switch from wye to delta

I'm replacing a pump: 400 V, 4 kW, 2 pole. It is a wye-delta startup. The control circuit is working correctly, as I've double checked it and extended the lead to feed another 4 kW motor. When it starts up in wye, I'm reading 9 A but then 57 A when…
Benjamin Seguin
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Can I solve Y-Δ circuit by converting it to Y-Y? Or do I need to solve it using Y-Δ formula?

Above is the picture of how I approach the 3(ii) question. My question is,which way is the correct way of finding line/phase currents/voltages? Why is the line/phase current different for each method? Simulation of circuit
incognitomodus
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□ -> X Conversion

In cicuit analasys to make a circuit easier you can use delta wye conversion. This means that when there part of a circuit with 3 nodes, where each of the 3 resistors ar in betwen 2 nodes, this can be easily converted to a part of circuit with 4…
Arlindi Frakulla
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How do I refer an impedance from the delta side of a transformer to the WYE side?

My question is regarding the simple arrangement below: It is simply a three phase source feeding a load through Z1, followed by an ideal WYE DELTA transformer, followed by Z2. My question is how do I refer the impedance Z2 to the left hand side?
CKCK
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Y-Δ transform proof using superposition

In the Wikipedia page and in every book they prove the transformation by equaling the equivalent resistance between any pair of terminals while disconnecting the other node. https://en.wikipedia.org/wiki/Y-%CE%94_transform Why this should make the…
Biker
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Does the motor speed change with the fully automatic star(wye)/delta starter?

At no load, I connected a 380V motor to start in the star connection for 5 seconds and thereafter change to the delta connection. I understand that torque will change since the current will change as well. In fact, the torque should increase as the…
Ph3ng
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How to Transform AC Current from Wye to Delta?

What is the correct formula to transform AC current from a Wye connection to a Delta connection? I am not an electrical engineer, and this is my first question on this part of StackExchange. I hope it is understandable, and a "good" question.…
P. Siehr
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Resistance between the terminals of a star configuration?

The derivation of the delta-star transformation rules is based on the fact that the resistance between terminals 1,3 is R1+R3 I can't see how we can consider R1,R3 just two resistances connected in series between terminals 1 and 3 with R2 having no…
n88
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Without converting the secondary side to "Y", how would one solve this question?

The question: "A three-phase 230 V, 27 kVA, 0.9 PF (lagging) load is supplied by three 10 kVA, 1330/230 V, 60 Hz transformers connected in Y-Δ by means of a common three-phase feeder whose impedance is 0.003+j0.015 Ω per phase. The transformers are…
Lerbi
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4 pronged star to two Y resistor network

Is there any transform that relates four resistors meeting at a central node simulate this circuit – Schematic created using CircuitLab to a set of two Y resistors networks as shown below simulate this circuit
furious.neutrino
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